AERIAL SECURITY

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09/04/2013 10:53 PM CDT

U.S. Marine Corps Gunnery Sgt. Marcus S. McCollum provides aerial security with a GAU-21 .50-caliber machine gun inside a CH-53E Super Stallion helicopter over Helmand province, Afghanistan, Aug. 22, 2013. McCollum, a crew chief, is assigned to Marine Heavy Helicopter Squadron 462.